Adjustable dumbbell



FIG. 1 is a front, right and top perspective view of an adjustable dumbbell, showing my design.

FIG. 2 is a rear, left and bottom perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof.

FIG. 9 is a partial enlarged view of an area labeled 9 in FIG. 1 ; and,

FIG. 10 is a partial enlarged view of an area labeled 10 in FIG. 3 .

The broken lines shown in the drawings are included for the purpose of illustrating portions of the adjustable dumbbell that form no part of the claimed design. In addition, the dot-dash broken lines in FIGS. 1, 3 and 9-10 depict the boundaries of the enlargements that form no part of the claimed design. 

CLAIM The ornamental design for an adjustable dumbbell, as shown and described. 